Question

我有一个主表Blends和一个表cards，它们之间有一对一的关系。在添加card时我会选择一个blend下拉列表，但卡片上有blend_id列。

添加card后，我想将card保存在表格中，blend_id值等于从下拉菜单中选择的混合ID。

我正在使用spring hibernate，这是我提交卡片形式的例外：

org.hibernate.TransientObjectException: object references an unsaved transient instance - save the transient instance before flushing: com.terp.entity.BlendEntity
    org.hibernate.engine.ForeignKeys.getEntityIdentifierIfNotUnsaved(ForeignKeys.java:243)
    org.hibernate.type.EntityType.getIdentifier(EntityType.java:456)
    org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:265)
    org.hibernate.type.ManyToOneType.isDirty(ManyToOneType.java:275)
    org.hibernate.type.TypeHelper.findDirty(TypeHelper.java:295)
    org.hibernate.persister.entity.AbstractEntityPersister.findDirty(AbstractEntityPersister.java:3403)
    org.hibernate.event.def.DefaultFlushEntityEventListener.dirtyCheck(DefaultFlushEntityEventListener.java:520)
    org.hibernate.event.def.DefaultFlushEntityEventListener.isUpdateNecessary(DefaultFlushEntityEventListener.java:230)
    org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:154)
    org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:219)
    org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:99)
    org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:50)
    org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1216)
    org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:383)
    org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:133)
    org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:656)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:754)
    org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:723)
    org.springframework.transaction.interceptor.TransactionAspectSupport.commitTransactionAfterReturning(TransactionAspectSupport.java:393)
    org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:120)
    org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
    org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)
    $Proxy26.addCard(Unknown Source)
    com.terp.controller.CardController.addCard(CardController.java:122)
    com.terp.controller.CardController$$FastClassByCGLIB$$43e17ccc.invoke(<generated>)
    net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
    org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:617)
    com.terp.controller.CardController$$EnhancerByCGLIB$$4627162d_2.addCard(<generated>)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:427)
    org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:415)
    org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788)
    org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
    org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
    org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

从异常似乎它想要保存选定的blend对象，但我不想保存混合，因为这是我的主表，我只想在我的cards表中引用它。

这些是java类：

BlendEntity.java

package com.terp.entity;

import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.hibernate.annotations.Proxy;


@Entity
@Table(name="blends")
@Proxy(lazy=false)
public class BlendEntity {

    @Id
    @Column(name="id")
    @GeneratedValue
    private Integer id;
    private String name;
    private String code;

    @Temporal(TemporalType.TIMESTAMP)
    private Date created_at;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public Date getCreated_at() {
        return created_at;
    }

    public void setCreated_at(Date created_at) {
        this.created_at = created_at;
    }

}

CardEntity.java

package com.terp.entity;

import java.util.Date;
import java.util.SortedSet;
import java.util.TreeSet;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.OneToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

import org.hibernate.annotations.Proxy;
import org.hibernate.annotations.Sort;
import org.hibernate.annotations.SortType;
import org.springframework.transaction.annotation.Transactional;

@Entity
@Table(name="cards")
@Proxy(lazy=false)
public class CardEntity {

    @Id
    @Column(name="id")
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @OneToOne
    @JoinColumn(name="division_id", referencedColumnName="id")  
    private DivisionEntity division;

    private Integer card_series;
    private String card_number;
    private Integer shade;

    @OneToOne
    @JoinColumn(name="unit_of_qty_id", referencedColumnName="id")  
    private UnitEntity unit;

    private Date card_date;
    private Date issue_date;


    private String cutomer_ref;
    private String hl_number;
    private String design_number;

    @OneToOne
    @JoinColumn(name="designWay_id", referencedColumnName="id")  
    private DesignWayEntity designWay;

/*  @OneToOne
    @JoinColumn(name="dyeingType_id", referencedColumnName="id")  
    private DyeingTypeEntity dyeingType;*/

    private String dyeingType;

    private Integer total_days;
    private Date order_date;
    private Date grey_date;
    private Date target_date;

    @OneToOne
    @JoinColumn(name="qualityBase_id", referencedColumnName="id")  
    private QualityBaseEntity qualityBase;

    @OneToOne
    @JoinColumn(name="openFor_id", referencedColumnName="id")  
    private OpenForEntity openFor;

    @OneToOne
    @JoinColumn(name="width_id", referencedColumnName="id")  
    private WidthEntity width;

    @OneToOne
    @JoinColumn(name="finishType_id", referencedColumnName="id")  
    private FinishTypeEntity finishType;

    @OneToOne
    @JoinColumn(name="blend_id", referencedColumnName="id")  
    private BlendEntity blend;

    private Float weight;

    @OneToOne
    @JoinColumn(name="merchant_id", referencedColumnName="id")  
    private MerchantEntity merchant;

    @OneToOne
    @JoinColumn(name="priority_id", referencedColumnName="id")  
    private PriorityEntity priority;

    @OneToMany(fetch = FetchType.EAGER, mappedBy="card", cascade = CascadeType.ALL)
    @Sort(type=SortType.NATURAL)
    private SortedSet<ShadeEntity> shades = new TreeSet<ShadeEntity>();

    private Float total_qty;

    @Transactional
    public SortedSet<ShadeEntity> getShades() {
        return shades;
    }

    @Transactional
    public void setShades(SortedSet<ShadeEntity> shades) {
        this.shades = shades;
    }

    @Temporal(TemporalType.TIMESTAMP)
    private Date created_at;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public DivisionEntity getDivision() {
        return division;
    }

    public void setDivision(DivisionEntity division) {
        this.division = division;
    }


    public Integer getCard_series() {
        return card_series;
    }

    public void setCard_series(Integer card_series) {
        this.card_series = card_series;
    }

    public String getCard_number() {
        return card_number;
    }

    public void setCard_number(String card_number) {
        this.card_number = card_number;
    }

    public Integer getShade() {
        return shade;
    }

    public void setShade(Integer shade) {
        this.shade = shade;
    }



    public UnitEntity getUnit() {
        return unit;
    }

    public void setUnit(UnitEntity unit) {
        this.unit = unit;
    }

    public Date getCard_date() {
        return card_date;
    }

    public void setCard_date(Date card_date) {
        this.card_date = card_date;
    }

    public String getCutomer_ref() {
        return cutomer_ref;
    }

    public void setCutomer_ref(String cutomer_ref) {
        this.cutomer_ref = cutomer_ref;
    }

    public String getHl_number() {
        return hl_number;
    }

    public void setHl_number(String hl_number) {
        this.hl_number = hl_number;
    }

    public String getDesign_number() {
        return design_number;
    }

    public void setDesign_number(String design_number) {
        this.design_number = design_number;
    }

    public DesignWayEntity getDesignWay() {
        return designWay;
    }

    public void setDesignWay(DesignWayEntity designWay) {
        this.designWay = designWay;
    }




    public String getDyeingType() {
        return dyeingType;
    }

    public void setDyeingType(String dyeingType) {
        this.dyeingType = dyeingType;
    }

    public Date getOrder_date() {
        return order_date;
    }

    public void setOrder_date(Date order_date) {
        this.order_date = order_date;
    }

    public Date getGrey_date() {
        return grey_date;
    }

    public void setGrey_date(Date grey_date) {
        this.grey_date = grey_date;
    }

    public Date getTarget_date() {
        return target_date;
    }

    public void setTarget_date(Date target_date) {
        this.target_date = target_date;
    }

    public QualityBaseEntity getQualityBase() {
        return qualityBase;
    }

    public void setQualityBase(QualityBaseEntity qualityBase) {
        this.qualityBase = qualityBase;
    }

    public OpenForEntity getOpenFor() {
        return openFor;
    }

    public void setOpenFor(OpenForEntity openFor) {
        this.openFor = openFor;
    }

    public WidthEntity getWidth() {
        return width;
    }

    public void setWidth(WidthEntity width) {
        this.width = width;
    }

    public FinishTypeEntity getFinishType() {
        return finishType;
    }

    public void setFinishType(FinishTypeEntity finishType) {
        this.finishType = finishType;
    }

    public BlendEntity getBlend() {
        return blend;
    }

    public void setBlend(BlendEntity blend) {
        this.blend = blend;
    }


    public Float getWeight() {
        return weight;
    }

    public void setWeight(Float weight) {
        this.weight = weight;
    }



    public Integer getTotal_days() {
        return total_days;
    }

    public void setTotal_days(Integer total_days) {
        this.total_days = total_days;
    }

    public MerchantEntity getMerchant() {
        return merchant;
    }

    public void setMerchant(MerchantEntity merchant) {
        this.merchant = merchant;
    }

    public PriorityEntity getPriority() {
        return priority;
    }

    public void setPriority(PriorityEntity priority) {
        this.priority = priority;
    }

    public Float getTotal_qty() {
        return total_qty;
    }

    public void setTotal_qty(Float total_qty) {
        this.total_qty = total_qty;
    }

    public Date getCreated_at() {
        return created_at;
    }

    public void setCreated_at(Date created_at) {
        this.created_at = created_at;
    }

    public Date getIssue_date() {
        return issue_date;
    }

    public void setIssue_date(Date issue_date) {
        this.issue_date = issue_date;
    }

}

卡表中的禁令：

CONSTRAINT `fk_40` FOREIGN KEY (`blend_id`) REFERENCES `blends` (`id`),

如果我添加了级联卡片，它会在混合中添加一个新行：

@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name="blend_id", referencedColumnName="id")  
private BlendEntity blend;

Answer 1

您有持久性上下文问题。见What is Persistence Context。 未保存的瞬态实例不在持久性上下文中。

TransientObjectException javadoc：

当用户将瞬态实例传递给Session方法时抛出期望一个持久的实例。

两种可能的解决方案：

如果关系真的是@OneToOne，请考虑重新分解通过在Card表中定义Blend列来构建模式。 @OneToOne#optional和@JoinColumn#nullable都默认为true。但是，@OneToOne关系的意图是目标实体（行）不被多个引用实体共享。允许null Blend外键意味着 no Card可以共享许多Blend。
不要将@Transactional放在实体方法上。 Best practice是在服务（也许是Dao）层上定义@Transactional。此外，检查您的Service / Dao / Repository配置和代码，确保两个实体都由相同的持久性上下文管理，例如，find() @PersistenceContext混合ID引用的先前持久的Blend实体，然后将其分配给卡。为了更好地理解实体，实体管理器，持久性上下文和事务如何交互，我从Pro JPA 2, 2nd Edition by Mike Keith and Merrick Schincariol中删除了以下要点。我与作者无关。
- Dao / Repository层必须使用JPA EntityManager进行持久化。
- 实体管理器管理持久性上下文，即一组持久性实体实例。
- 持久化实体具有内存中对象标识和由（主）密钥唯一标识的数据库表示（行）定义的数据库标识。
- 瞬态实体没有数据库表示，无论应用程序是否设置了实体＆＃34;＆＃34;独特的身份＆＃34;字段（一个或多个）。
- Java内存模型不是事务性的。分离（或瞬态）对象实体的状态不会与DB自动同步。
- 如果持久化上下文参与事务，则托管实体的内存中状态将与数据库同步。
- 分离（临时）实体不能与需要托管实例的任何实体管理器操作一起使用。
- 实体管理器类型确定持久化上下文的生命周期。
- JPA定义了3种类型的实体管理器，每种类型都需要不同的持久化上下文管理：
- 容器管理的EntityManager：
  - 交易范围：
    - type=PersistenceContextType.TRANSACTION //默认为@PersistenceContext(type=PersistenceContextType.EXTENDED)
    - 使用事务作为跟踪/传播持久性上下文的方法。
    - 无国籍;它可以安全地存储在任何Java EE组件上。
    - 容器代理持久性提供程序的实体管理器，以便管理其生命周期。
    - 当app调用实体管理器方法时，容器的实体管理器代理会检查现有的持久性上下文与当前交易相关联。如果代理找到一个，则实体管理器将使用现有的持久性上下文。如果它找不到一个，代理创建一个新的持久化上下文并将其与事务相关联。
    - 当交易结束时，持久性上下文消失，＆＃34;并且由上下文管理的所有实体都会分离。
    - 同一事务中的所有容器管理的实体管理器必须共享相同的传播持久性上下文。
  - 扩展范围：
    - close()
    - 单个持久化上下文，其范围限定为有状态会话bean的生命周期，可能跨越多个事务。
    - 防止实体在单个交易结束时脱离。
- 应用程序管理的EntityManager：
  - App管理实体经理的生命周期;必须致电EntityManagerFactory.createEntityManager()。
  - 创建自己的私有持久化上下文，持续到实体管理器关闭为止。
  - 如果在事务处于活动状态时创建，则自动与事务同步;别的没有。
  - Java SE中提供：@PersistenceUnit。
  - Java EE中提供：EntityManagerFactory。
  - 支持无容器的单元测试。
  - 应用必须明确关闭{{1}}实例。 Java EE容器将自动关闭工厂。
  - 仅可为资源本地事务配置的实体管理器类型
  - 可以使用JTA或资源本地XA

spring - hibernate - org.hibernate.TransientObjectException：object引用未保存的瞬态实例

1 个答案:

两种可能的解决方案：